Hi maplers

I am using maple 14 on windows 7 and every time maple have to evaluate anything a progressbar pops up. It frezes at about 60%. I have read other post that suggest to turn off my firewall, but without any luck.

Then i tried to manually upgrade to the newest verion(14.01). I then get a "Invalid Purchase Code" msg. with the argument: "system clock has been set back". i then re-activate and maple pulls the same stunt after a restart(it askes for a restart after activasion).

Does anyone know how to control the placement of the directional arrows for a digraph?

Here's an example:

with(GraphTheory):

G := Digraph(Trail(4,2,1,3,4,5),Trail(6,8,9,7,6,5));

SetVertexPositions(G,[[0,1],[1,1],[0,0],[1,0],[2,0],[3,0],[4,0],[3,1],[4,1]]);

DrawGraph(G);

produces:

The...

Symbolic_integral.mw

Thanks in advance

How do I plot the numeric solution for both x(t) and y(t) on one graph to the differential system:

x'(t) = 2*x(t)-x(t)*y(t),   y'(t) = -y(t) + 0.4*x(t)*y(t)

x(0) = 5 and y(0) = 1

Thanks

Hi,

I'm trying to enter a statement on more than one line, but have done so without success. When I press Shift+Enter, Maple adds a new blank line without the command prompt ">".

Any ideas of what I'm doing wrong?

Thanks in advance,

Carlos Mallen

Hello,

I use the fellowing commands to get the figures which I want to insert in a microsoft word document.

sys3 := NewSystem((4*s^2+64*s+224)/(s^4+32*s^3+304*s^2+896*s));
BodePlot(sys3);

But the figures are too big. I want to change the figure size by using some commands, namely, make the figures smaller, but don't change the frequency (x-axes) and magnitude/phase (y-axes) of them. So after size-modifying, the figures can be inserted in a word document properly.

Hello Maple wizards,

I am working with thousands of fairly large (at least 11K nonzero entries) strictly lower triangular Arrays containing positive and negative floating point numbers, including float(1,infinity). The Arrays are the same size and each one can be processed independently, so I hope to avoid a space explosion by having each Array overwrite the previous one -- lhs(entry) and all that. I do see a steady leakage not recovered by gc, but that's not tonight's question.

Hello everyone,

Groebner[NormalForm] fails to produce quotients for the members of Ideal when MonomialOrder is constructed with Ore_algebra.

e.g. Groebner[NormalForm](F[1], G, T, 'Q');
results in "Error, (in Groebner:-NormalForm) numeric exception: division by zero"
if F[1] in <G> and T is MonomialOrder

But it works if we dont ask for quotients or use ShortMonomialOrder

Any ideas if it is intended behaviour or a bug?

Steps to reproduce:

Hello All;

After having access to maple since maple 7 and never realy learning it, I decided that I would give it a good stab.

So far it's been cooperative. but I started from basic things wand worked my way through. I am now at the point where I need thisgs done and can't figure how to do them... shrort of rewriting the equations in the form I want.

I am working on exact differential equations and I need to convert this form:

Can anyone help me understand why the following happens?

N := GraphTheory[Digraph]({[1,3],[3,9],[9,27]});

GraphTheory[IsNetwork](N);

and

M := GraphTheory[Digraph]({[1,2],[2,4],[4,8]}); 

GraphTheory[IsNetwork](M);

both indicate that the graph is not a network.  On the other hand, for numbers n other than 2 and 3, Maple does recognize the graph {[1,n],[n,n^2],[n^2,n^3]} as a network.

This procedure that I wrote:

Hello.

My question is quite simple : how can we define the size in pixels of a plot ?

After plotting we can change the size of the image with the mouse but it is quite approximative.

For example is it possible to display (by default) all the plots of a worksheet in 800x800 pixels ?

Thank you very much.

Hello everybody !

I am trying to display some solutions for the differential equation :

eqdiffyx75:=

When I make a DEplot, with the command : DEplot(

I have problems with a variable that is given only implicitly. Maple provides incorrect answers but I am not sure where I make the mistake. Thanks for any comments! Here is what I do:

(1) I use "assume" to set properties of two paramters a and b.

> assume(a > 1);
> assume(b > 1);

(2) Since the variable "x" is given only implicitly, I define an implicit function following the description in the thread "How to define an implicit function in Maple?".

Hello,

I'm making a simple for loop with a few lines.  I just figured out how to Shift + Enter to go to a new line without yet executing.  How do I indent my code on the next line, like in every other programming language ever made?  The Tab key does nothing.

Thank you.